Break on window close when the inspector is open

Source/devtools/front_end/sources/BreakpointsSidebarPane.js

 /*
  * Copyright (C) 2008 Apple Inc. All Rights Reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 524 matching lines @@
     this._createCategory(WebInspector.UIString("Device"), ["deviceorientation", "devicemotion"]);
     this._createCategory(WebInspector.UIString("Drag / drop"), ["dragenter", "dragover", "dragleave", "drop"]);
     this._createCategory(WebInspector.UIString("Keyboard"), ["keydown", "keyup", "keypress", "input"]);
     this._createCategory(WebInspector.UIString("Load"), ["load", "beforeunload", "unload", "abort", "error", "hashchange", "popstate"]);
     this._createCategory(WebInspector.UIString("Media"), ["play", "pause", "playing", "canplay", "canplaythrough", "seeking", "seeked", "timeupdate", "ended", "ratechange", "durationchange", "volumechange", "loadstart", "progress", "suspend", "abort", "error", "emptied", "stalled", "loadedmetadata", "loadeddata", "waiting"], false, ["audio", "video"]);
     this._createCategory(WebInspector.UIString("Mouse"), ["click", "dblclick", "mousedown", "mouseup", "mouseover", "mousemove", "mouseout", "mousewheel", "wheel"]);
     this._createCategory(WebInspector.UIString("Timer"), ["setTimer", "clearTimer", "timerFired"], true);
     this._createCategory(WebInspector.UIString("Touch"), ["touchstart", "touchmove", "touchend", "touchcancel"]);
     this._createCategory(WebInspector.UIString("XHR"), ["readystatechange", "load", "loadstart", "loadend", "abort", "error", "progress", "timeout"], false, ["XMLHttpRequest", "XMLHttpRequestUpload"]);
     this._createCategory(WebInspector.UIString("WebGL"), ["webglErrorFired", "webglWarningFired"], true);
+    this._createCategory(WebInspector.UIString("Window"), ["close"], true);
 
     this._restoreBreakpoints();
 }
 
 WebInspector.EventListenerBreakpointsSidebarPane.categoryListener = "listener:";
 WebInspector.EventListenerBreakpointsSidebarPane.categoryInstrumentation = "instrumentation:";
 WebInspector.EventListenerBreakpointsSidebarPane.eventTargetAny = "*";
 
 /**
  * @param {string} eventName
@@ skipping 256 matching lines @@
         var breakpoints = WebInspector.settings.eventListenerBreakpoints.get();
         for (var i = 0; i < breakpoints.length; ++i) {
             var breakpoint = breakpoints[i];
             if (breakpoint && typeof breakpoint.eventName === "string")
                 this._setBreakpoint(breakpoint.eventName, breakpoint.targetNames);
         }
     },
 
     __proto__: WebInspector.SidebarPane.prototype
 }